Rails - Dec 2010 - a form that calls JS only (w/no POST or GET)?

I need to do some JS processing in the client before contacting the
server (fwiw, this is for Google geocoding).  The JS does its processing
and concocts a form to send back to the server.  The latter part is
working fine.

In a previous iteration, I had the following.  It activated the JS code
on any change to the text field, and worked (although now I know I
should use a text_field_tag rather than abusing a text_field):

<!-- a named field for the authenticity_token so initialize() can find
it. -->
<input type="hidden" id="authenticity_token"
value="<%form_authenticity_token %>"\>
<!-- a field for the user to submit a raw address for geocoding -->
<div class="raw_address">
Type an address: <%= text_field :raw, :address, :onchange =>
"geocodeAddress()" %>
</div>

But now now that I''ve added another field, my instinct says to create a
form with a submit button.  But I don''t see how to create a form that
does NOT submit HTML when the submit button is pushed.  Here''s the
errant form.  What I want is the "search" button to call
geocodeAddress() and nothing more.

<%= form_tag(premises_path, :remote => true) do %>
  <%= hidden_field_tag("authenticity_token",
form_authenticity_token,
:id => "authenticity_token") %>
  <%= label_tag("address", "Type an address:") %>
  <%= text_field_tag("raw_address", nil, :size => 96, :id =>
"raw_address") %>
  <%= label_tag("occupants", "Occupants:") %>
  <%= select_tag("occupants", options_for_select([0.5, ..., 8.0],
2.0))
%>
  <%= submit_tag("search", :onchange =>
"geocodeAddress()") %>
<% end %>

Suggestions?  (Perhaps I could just lose the form altogether...)

- ff

P.S.: Marnen, I know what you''re thinking! :) I''ll reframe it
as UJS
once I get the basics working.

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Sounds like you want a button with the onclick event. If so, there''s
(apparently) a helper for that:

http://apidock.com/rails/ActionView/Helpers/JavaScriptHelper/button_to_function

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djangst wrote in post #971568:
> Sounds like you want a button with the onclick event. If so,
there''s
> (apparently) a helper for that:
>
>
http://apidock.com/rails/ActionView/Helpers/JavaScriptHelper/button_to_function
@djangst: that''s what I''ve ended up doing.  Upon reflection,
I''m
wondering why I thought everything needed to be in a form.  Works fine
without it, as in:

<%= hidden_field_tag("authenticity_token", form_authenticity_token,
:id
=> "authenticity_token") %>
<%= text_field_tag("raw_address", nil, :size => 96, :id =>
"raw_address") %>
<%= select_tag("occupants", options_for_select([0.5, ... 8.0],
2.0)) %>
<%= submit_tag("search for address", :onclick =>
"geocodeAddress()") %>

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